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<br />..... <br /> <br />n <br />v <br />L)- <br /> <br />19.20 <br />have been made . They are reproduced on Tables 2-; and 2-8. When treated <br />condensate is diluted ~ith an equal volume of San Juan River water, a ?robable <br />composition of the mixture is that shown on Table 2-9. With the addition of <br />some acid and some anti-scale chemicals, this ~ater can be concentrated ei9htfold <br />and circulated at a pH of about 7.5 without scale forrnation6. It has been <br />assumed by the designers, and we agree, that the organic contamination is not <br />bad and' that the tower will operate. <br />Of all the plant designs we have seen or made, this plant has the highest <br />organic contamination in the makeup water. We have used this to suggest upper <br />limits of permissable concentrations in makeup. The limits shown on Table 2- <br />10 apply to ~~e mixed makeup; they are high and will require good control by <br />the ogerators, but they are not necessarily the maximum. Trea~~ent to ~,is <br />quality is, for this report~ regarded as necessarj, i~-~l~~t, treatment. <br />Treatment to a better quality is, for this re~ort, regarded as trea~~ent for <br />environmental protection pnc is discussed later. Please recognize that t~e <br />limits are rat~er arbit~ary. In particular the limit on ~onia re~ui:es <br />discussion.. <br />kmmonia is driven off in a cooling tower. Ammonia coes not concentrate in <br /> <br />a cooling tower and will be reduced in concentration if a large enough .E:-action <br />(approximately more than 85\) of the makeup wate: is evaporated rather than bloW!'. <br />down. This is easily calculated from vapor data and has :,een 10 <br />pressure de..'"nonstrated . <br /> <br />The ~ost important limit to the pe~issable concentration in the makeup water <br />is the formation of noxious fumes. Our calculations show that the odor ~~resholc <br />tor ammonia in the cooling tower plume will nQe be exceeded wi~, ammonia <br />concentrations of up to 500 mg/l. Therefore, the limit of 100 mg/l, shown <br />on Table 2-10, should be no problem. Removal of ammonia :,elow the limit shown on <br />Table 2-10 may be required to avoid air pollution, but the costs of doing this are <br />specifically excluded from this contract. <br />Because of ammonia, copper should not be used as a material of construction <br />and chlorination, which is not planned, will be reduced in efficacy. <br />2.7 Wastewater Trea~ent for Internal Plant Reuse <br />In this section we briefly discuss the waeer treatments used to improv~ <br />process condensate to the quality shown on Table 2-10, wit~ emphasis on the <br /> <br />" <br />n <br />